Chief disadvantage of a nonfunctional fixed space maintainer

 # What is the chief disadvantage of a nonfunctional fixed space maintainer?

A. Prevent lateral jaw growth

B. Difficult to fabricate

C. Difficulty in maintaining proper oral hygiene

D. Continued eruption of opposing tooth

The correct answer is D. Continued eruption of opposing tooth.

Supra eruption of opposing teeth can take place if pontics are not used i.e. non functional fixed space maintainer is used. 

Other disadvantages of fixed space maintainer:

- Expert skill and elaborate instrumentation is needed 

- Decalcification of tooth under bands 

- If functional (pontics) space maintainer is used, it can interfere with vertical eruption of abutment tooth and prevents eruption of replacing permanent teeth if the patient fails to report.